Net Income Per Common Share and Net Income Per Common Unit - Schedule of Net Income Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Basic:
Net income available to common stockholders/unitholders	$ 106,186	$ 203,110
Weighted average common shares/units (in shares)	64,454,912	64,314,899
Per common share/unit amount (in dollars per share)	$ 1.65	$ 3.16
Diluted:
Net income available to common stockholders/unitholders	$ 106,186	$ 203,110
Weighted average common shares/units (in shares)	64,461,621	64,349,899
Per common share/unit amount (in dollars per share)	$ 1.65	$ 3.16
Essex Portfolio, L.P.
Basic:
Net income available to common stockholders/unitholders	$ 109,855	$ 210,389
Weighted average common shares/units (in shares)	66,681,908	66,621,852
Per common share/unit amount (in dollars per share)	$ 1.65	$ 3.16
Diluted:
Net income available to common stockholders/unitholders	$ 109,855	$ 210,389
Weighted average common shares/units (in shares)	66,688,617	66,656,852
Per common share/unit amount (in dollars per share)	$ 1.65	$ 3.16
Stock options
Basic:
Effect of dilutive securities	$ 0	$ 0
Effect of dilutive securities (in shares)	6,709	35,000
Stock options | Essex Portfolio, L.P.
Basic:
Effect of dilutive securities	$ 0	$ 0
Effect of dilutive securities (in shares)	6,709	35,000